132 INDEX TO KEY TO FAMILIES. 



Group 4. Birds having wings measuring from 3.25 to 9.50 inches 



..... ... -139 



Section 1. Bill with strong hook, toes armed with talons . 139 

 Section 2. Upper mandible with more or less hook, but toes 



not armed with talons . . . . . 149 



Section 3. Tip of upper mandible not notched or hooked . \\ 

 Part 1. First primary less than half as long as 



third, sometimes very small . . . 145 

 Part 2. First primary more than half as long as 



third ..... . 143 



Group 5. Birds having wings over 9.50 inches long . . j j- 



